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July 2014

MIKE SPRINGER/Staff photo
Hope Castellucci, 6, watches as her brother Josia, 11, mixes up an "exploding lunch bag" during a meeting of the kids' science club at Sawyer Free Library in Gloucester. The activity involved mixing baking soda and vinegar inside a zip-lock bag, sealing it and watching as carbon dioxide gas built up inside the bag, making it burst.